Pakistan Stratigraphy · stratigraphy.pk
Chashmai Formation
https://stratigraphy.pk/formation/chashmai-formation
Stratigraphic position
Band colour = period; texture = dominant rock type. Lines between bands mark the contact type. True scale makes height ∝ recorded thickness; hatched = thickness not recorded. Ages approximate, for ordering.
This unit (highlighted) within its province column; faded ends continue above and below. Line style marks the contact type.
The sandy-and-shaly western version of the Eocene Kohat rocks — the same age as the Shekhan limestone but made of clastic sediment.
Named after Chashmai area in Kohat. Marginal marine to continental sequence. Part of the Panoba Group.
Significance. The western clastic (siliciclastic) lateral facies of the Eocene Kohat succession, equivalent eastward to the carbonate Shekhan Formation and, in the centre and south, to the Bahadar Khel Salt–Jatta Gypsum evaporites.
- Lithology
- Clastic facies — sandstone and shale — of the Eocene Kohat succession.
- Thickness
- 50-150 m
- Type locality
- Chashmai, Kohat
- Environment
- shallow marine
Fossils
Provinces
References
- Malkani, M.S. & Mahmood, Z. (2017). Stratigraphy of Pakistan. Geological Survey of Pakistan, Memoir Vol. 24.
- Khan et al. (2019). Foraminiferal studies of the Eocene Shekhan Formation, Panoba section, Kohat, northern Pakistan: implications for biostratigraphy and palaeoenvironments. International Journal of Hydrology (MedCrave).
Reviewer confidence: medium
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